Bug 2526747
| Summary: | graphviz 'cluster' crashes: SIGSEGV on -C 0 -c 1, SIGABRT on empty graph | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Petr Sklenar <psklenar> |
| Component: | graphviz | Assignee: | Jaroslav Škarvada <jskarvad> |
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 45 | CC: | alex, go-sig, jskarvad, r-maint-sig, spotrh |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2026-09-25 18:46:18 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
[root@vm-10-0-185-12 ~]# cluster -C cluster.c:96: claimed unreachable code was reached Aborted (core dumped) cluster -C [root@vm-10-0-185-12 ~]# /usr/bin/edgepaint -o --lightness -s -v --share_endpoint edgepaintmain.c:231: claimed unreachable code was reached Aborted (core dumped) /usr/bin/edgepaint -o --lightness -s -v --share_endpoint [root@vm-10-0-185-12 ~]# cluster -C 0 -c 1 /tmp/big.dot ncluster = 20000, mq = -0.000100 maxgain=0.000025, merge 0, 1 Segmentation fault (core dumped) cluster -C 0 -c 1 /tmp/big.dot Upstream bug: https://gitlab.com/graphviz/graphviz/-/work_items/2857 Fixed in 16.1.0 (in Rawhide/F46). |
graphviz 'cluster' crashes on Fedora 45 (graphviz-15.1.1-1.fc45). Two reproducers, both crash 100% of the time: 1) SIGSEGV (segfault) - option combination -C 0 -c 1: python3 -c 'print("graph G {"); [print(f"n{i} -- n{(i+1)%20000};") for i in range(20000)]; print("}")' > /tmp/big.dot cluster -C 0 -c 1 /tmp/big.dot -> Segmentation fault in Multilevel_MQ_Clustering_establish() <- main() 2) SIGABRT - empty graph: echo 'graph G {}' | cluster -> cluster: SparseMatrix.c:427: SparseMatrix_from_coordinate_arrays_internal: Assertion `m > 0 && n > 0' failed. Expected: clean error exit, not a crash. Core dumps available. Also reproduces on Fedora 44 (graphviz-14.1.4-2.fc44). Found via automated crash-testing with Claude Code